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Finding the Fourth Proportional to 339.28, 508.92 and 82.78

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Solution

The fourth proportional to 339.28, 508.92 and 82.78 is: 124.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.28 : 508.92 = 82.78 : x
  2. Step 2: Convert to fraction form
    339.28/508.92 = 82.78/x
  3. Step 3: Cross multiply
    339.28x = 508.92 × 82.78
  4. Step 4: Simplify right side
    339.28x = 42,128.40
  5. Step 5: Solve for x
    x = 42,128.40/339.28
  6. Step 6: Final answer
    x = 124.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.